As a noun spelunker
is one who explores caves; one who spelunks.
As a verb spelunked is
(spelunk).
spelunked
English
Verb
(head)
(spelunk)
spelunk
English
Noun
(
en noun)
(obsolete) A cave, cavern or grotto.
Synonyms
* cave
Derived terms
* spelunker
* spelunking